TY - CONF

T1 - Direct determination of the turbulent flux by simultaneous application of filtered Rayleigh scattering thermometry and particle image velocimetry

AU - Most, Dieter

AU - Dinkelacker, Friedrich

AU - Leipertz, Alfred

N1 - Funding Information: The authors gratefully acknowledge financial support of the Deutsche Forschungsgemeinschaft.

PY - 2002

Y1 - 2002

N2 - In a moderate turbulent and in a highly turbulent premixed CH4/air flame, two-dimensional simultaneous measurements of instantaneous velocity, temperature and density were performed using particle image velocimetry (P1V) and planar filtered Rayleigh scattering thermometry (FRS thermometry). Measurements indicated the existence of counter-gradient transport in the highly turbulent bluff-body stabilized flame while in the wire stabilized flame type with moderate turbulence, the Favre mean turbulent flux (FMTF) was fluctuating around zero. The direct FMTF determination was tested against other models of the turbulent flux using either a scalar gradient approach or binary conditioned velocity data following the thin flame approach of the BML model. Only the latter one showed good agreement with the direct FMTF determination but resulted in more noisy data. In the bluff-body stabilized flame from two-dimensional plots of the axial FMTF regions with either dominant gradient or dominant counter-gradient diffusion could be identified within the same flame. Original is an abstract.

AB - In a moderate turbulent and in a highly turbulent premixed CH4/air flame, two-dimensional simultaneous measurements of instantaneous velocity, temperature and density were performed using particle image velocimetry (P1V) and planar filtered Rayleigh scattering thermometry (FRS thermometry). Measurements indicated the existence of counter-gradient transport in the highly turbulent bluff-body stabilized flame while in the wire stabilized flame type with moderate turbulence, the Favre mean turbulent flux (FMTF) was fluctuating around zero. The direct FMTF determination was tested against other models of the turbulent flux using either a scalar gradient approach or binary conditioned velocity data following the thin flame approach of the BML model. Only the latter one showed good agreement with the direct FMTF determination but resulted in more noisy data. In the bluff-body stabilized flame from two-dimensional plots of the axial FMTF regions with either dominant gradient or dominant counter-gradient diffusion could be identified within the same flame. Original is an abstract.

UR - http://www.scopus.com/inward/record.url?scp=0036923417&partnerID=8YFLogxK

M3 - Paper

SP - 80

T2 - 29th International Symposium on Combustion

Y2 - 21 July 2002 through 26 July 2002

ER -